Rack : I need your help

Hi,

I'd like to order a rack like this: an horizontal surface 145x45 cm with two side vertical to it surfaces 120x45 cm.
I hope you can imagine it.
I will put two very heavy turntables on it, with their motor units separate from the turntables.
I need a material sonically neutral and resistant.
I think that solid wood is better than mdf, but much heavier.
Which wood is the best choice?
Any advice is welcome, thank you.